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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d044c3d42d93cdf9e7a4d4ffac42eddf14886d7dda1946f907f5019b56a15dc' 
  AND token = '1OoEwcA0U5HbpkHb85jgLTe1Zr6SoFxLc/ohOWSHFu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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