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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99018e6855e875e1fe9445e7727f7d44ebe072bdc38df923531619ab8203f823' 
  AND token = 'KZVrW4rC/effla6EppO85UllkF2Ij7Slv33Tzxx2N4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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