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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71ecba83b63945e19746b04c31257be89987d4bb34b8a17070d8e3b80d49b1bf' 
  AND token = '7lRhLXAB0DatNIj9ZY8EjUD54K8BXuUaPsSxjzHkyoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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