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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cd80267628d5d9a2464e4f5ef4cd0cfe8774dfe9387983c9127ac4cb4eedfa3' 
  AND token = '7cVx4StrCT2hS7IVz2ZmRaVVqlLE/3xh+ivP09OiIZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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