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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dce3de2ba05e3cb6f6e2b57de358adcf33e62d519e89ecf1eb0b9ebd9d6f3ec' 
  AND token = '4XtxMOyABU4vv84wtyP0SV0OkKHEbPtuimY3MQp6UDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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