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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02ad0db842a5b461bc8866ce7e244cbcc941d02a66df9289992a78370213a7ac' 
  AND token = 'xt/T9702LZowQPmmzfbtYeC72daFdNUiXMEQ/5GLx28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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