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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caae78dc03142eee7d7ebe4c5e9a54b8f19647a539d90e1c456e2251a98ded38' 
  AND token = 'KA+YvtvpXldBye6c5aBJldiEqxmgW2AkrDKRq3AOs1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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