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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15016a7a053b22d98ea04ce9cac43d32f091c4e3a742c51de753ff862784f940' 
  AND token = 'QNI+iNtI3hPZmCSxM9SFivmO1zejMjrnEeGw0lvMH6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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