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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bccb57e42afd30ddfbb3220e967903e5bc1d6e80be8a2dbee54b46139f1d5d25' 
  AND token = 'iDwDVYRslnNUEItdq7LpvJ0D6BJWcSSSjQyddIQv/B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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