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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3512d2397cebe6a36f371ba2c136d27ced1beeec3660aeaa9237d5f23a5b6475' 
  AND token = 'WOKz3brM2Nky6GIFKnF66swE3iVHGRctZC7ogdp4eA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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