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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12bd03e63eea212160d9ec5194e9c2211305cda97062daf31696f79f168b396f' 
  AND token = 'gtj/nfZUvsKykWD/emQXXTmm9EI4IOl2ufHU+PUvgds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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