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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7592b274eb2fc1c2fd6a53203d2651d839e74fe0225a4288515a0c04a4a19ee7' 
  AND token = 'MdP3JPxk5v8bH6d6iDBjFH92oIh8/IwZSc4WPy2411A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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