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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b3381e8dccc0952ddcedd442c9daf2db1cd0b259024e7155c05d4f0cfef91b5' 
  AND token = '6Td9WlGCdsBapmANIrjP58oRnXruobrsMhZ/6meMBcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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