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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56d0af39468b85d1dfd5592c8a55208c6996254186ee3bc9cd2bc767afd6b3da' 
  AND token = 'tHJRox4cqi0XDnGfYEzK/u6n8p1hDzMy1rotz9Kt198=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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