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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ef3b60068fa1e8bc10189d205ddb803b22d444d105f12a381afb10b476bb052' 
  AND token = '6bXvhWh8CaZI8tEMUFZntiMBw9p3tdxAKFE1Zx+N3uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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