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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5f7987056ff9b1c945f64cff16190d305e163b5ca91133410264432154ffa63' 
  AND token = '8sZs40A7pA9tpvBfx6Aw0SA7KUkJk9XE/azm0EGfG6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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