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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2736d4b5fc6be8c65c4caac0db6bafe8802296f39b4d8312af474b9341f69a67' 
  AND token = 'buQ1Ovo8DBrROIM6AwoPwFLceh1bkvS46AzlewxDdIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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