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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6c2607d5525a949cd09b2556e00c42a380ddc4b43babaea68379ef3f9458682' 
  AND token = 'xTyvlE+Icg4FS+od9EyYNUKlQDi/qQkz7l1NEkj2jS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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