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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0a7bca919ff8db3f4cc7073c5d2899870d95f050c28f872ab5d0041f6ad5812' 
  AND token = 'tQmmnKzr9xOTkg4KONIj8shJwrkxKC054sHtKgqfy6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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