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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '290aef3a0d58fbbde3291af570b9bf64c55bcec576d4b5ea72a102957b95c8a8' 
  AND token = 'l1vLxqqh1Qxeg45U5OyuYtZEgS6PFU37eAUD6P1R800=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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