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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '964bd8026fe3290a0fc112d2c0a84b8d97eb595c761314b1aef05c771fe7f989' 
  AND token = 'R9CKqKLG1ewJm4GWUwuYSAc/2omSePEa0e5FjtmPkN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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