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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e2aa577a3ac40f9b9dd24ba5086bfc57272b77c77d95d76702f81f288c2a0cf' 
  AND token = 'nsTUpF0ajSh2ccwhGaaahSakoQOeZjma9yhF5UJjHt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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