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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c3d5ed8afefca907021967f7aa5eaa943026d4dae676d2123608ca629613703' 
  AND token = 'xxygQVHqv7OVEyda/7JF3H0sXu8Y5pGH+4SN9FxipsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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