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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dca5f6f55d100eecafea2fcfc40e692a4426cdbac34b7861932847e816380392' 
  AND token = 'Z7p0Wllmxk/gTvI/O75JJSHtEaxkfYj/ldjyRQM0yVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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