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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a02b91b0198c9c1ff4f81ed86ea44d35071ea66b285a5104059432c89b25d259' 
  AND token = 'qJPG30usn8DjWCs8yswA3H2bwdbaoRcucbGbMdXn5p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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