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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4baa3e2c9611c33582e1ed13064ebccd44ed95d33bf4339c1f019130375ac8f' 
  AND token = 'LvEvDwVOVBetje2tNK1T2R7GK7YO8jLpLdZicMwqghE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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