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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8268156b72a913e4808cde9f84b8007c864c10287851e80e6ff06fde5cb2451' 
  AND token = 'RIfHhb27fZ/5Y1VycTduZvJamRMJ3QmLaJujeEsGD1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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