SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d06032e9a65682e7d3b60a37891b88b5c3540b28d41dfe015d697bebad77e88' 
  AND token = 'cOTyRXawO/ThMKiu6p3OWa/c+ZGE2mzFY5juF7VhADc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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