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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3ad5bb22c166bbcae77b9ef652b1ff53dbbaf9f4928ad4e6286893092e47905' 
  AND token = 'tBhX3GvLlckBtzcwTSiuPtKpkm2aP4xe8T8PF81Gx6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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