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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e65f97228da84a45a54417472f4ee85bebdeed9fcafd63449331c23a8a3376b9' 
  AND token = '/3a6aZJbPnoGR51GPr9OHgx9vyGY8O726RKCB8bZQXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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