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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c318db3b80864b8da21f16504618a6a55fa26ea237cc81719baf2f042010f40' 
  AND token = 'MzC00acXge34Np2aTwXgyz/9On1+/UOiQ/oB2rtdK1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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