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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d43986eb9754a1aadf5136a9a2ad19fee1e6b34650e83e6b1a3395598880ef6' 
  AND token = 'trZmM9apYn2c9uBNl7vNtORG/2EPJpWNDypzUc2qvPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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