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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d329da7442da6e3e150116b292b3464d6e1a6a38608306d9c3d1748707a3ee0' 
  AND token = 'BL3MyPQxdB7vRJ2mXadeGxuRti19+y+AnhPky941IbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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