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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e795189ff8c4d5fc561519b266b79372ba6ce8f1d55fc846713c4d77ed59c90e' 
  AND token = 'lxmtV7tfz2BP/nZ9iDd9aS9Kt4U7znrGvD3ZGrpFDmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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