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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90c5a0dc37de2106cf4d7fd85e8cec253da4ba8077558c1b1f45135c0c087b0b' 
  AND token = 'btxKdLsYF2TcGZtaXbf3p2LCuOxryZm7ppEg8YJ81es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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