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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bbe7d6e1389021f03746ed638bf17f2b0bf4b9c6306da95c41564d2908f9416' 
  AND token = 'M3LTpDx+hW1SsVWGlAvX82gypk1JBbxpmQfiuxpIma0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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