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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f69279628a8f1c5214c5ae47a40f6c9d3dc202221b86c58ebc9a0e8308c59ebd' 
  AND token = 'OpkOoGchEfMHADZQWBI6KQqUOlL7ks4ct34gLIUuhLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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