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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fa9f3daa19ce7b8874619c367382d9de3bc21cfc903e38df6ce1eb61cfd8a58' 
  AND token = 'mVLQiZj+bjEnD9ZMeIhAk0X8xHxqjzFGIiM4e2f+AW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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