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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acfc23c9019f79e7ba3bce61c7fae1cce0917dcefd23cc1619dfe873796a2fb1' 
  AND token = 'aCocNvyIIagAtxA+0kTPxf6a+pOAJCDJ0F0xldA3MMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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