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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d7c9fcac9c726a91a47df4c8e8acb18ec0253c290c380a4f811d36bf5a2789c' 
  AND token = 'IPMM00vDXnTjsuL/hp2j17+Zl1H4y7SU9wFeJbmhFUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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