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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'affb77165bd42fd650df29b092b57f5ef996e4ddfb75f9853a16101d259e9d82' 
  AND token = 'Y0KyghE4L9PlA8DhgkWMLkOSJIt63j96ZERi1rBVKpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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