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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '946bae05f7da6f602a45057478ef6fddeef0704999400fc2eb47ec2c7c99c2dd' 
  AND token = 'PJUgfV9eeJ4CnAZUoZW1ZNB6ueK2Z+L5l2TRfd1HGzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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