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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f88c476e158487896f764f356441ac02d20747155657065b61641f6a6bfca77' 
  AND token = 'ehH6wwahvFEF+RZculNUn4z2YuxZU0/qWCRlUhyR230=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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