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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8c18741dcd564bbcb239bce78e9f2edb7a0c726b99aaff0f23c08bc057c1684' 
  AND token = '/7SLu9qkrS69fCzxdssK9ASjw36YCANSauYgjAg7Asc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}