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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1605f62651e91f20fe735e8dc75fb74998bc8c8756781428bdfde3c70cb4ea8b' 
  AND token = 'GyxMbpG8BfZ4QzlSEb0hMBxLXAJjRtuboDNeNuisg8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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