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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a11f20ea3216e207c506d189e284c5fa12fc07ce295e316226c37a7d2877cfbb' 
  AND token = '40QisxsfSnARrV59Y082Lx9ExRJqqxu2V10aI+YhGeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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