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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c4640e82820ccdccac020859b387ede62dfada20101f27d8fadb273589d1a1c' 
  AND token = 'K0j7tPQDUvEDyj9/lDEWO04UbeUBS2q58fKOV9UGZso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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