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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce9a8068df833881e2119828fd79ee2b9486f767034e6040b7dadc71098fb8bf' 
  AND token = 'XrAwE/88Jw30WOKpcXNAxURsmgsMXhh23qSdkGs9bPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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