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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2101e91885dbb6f5587d6ff4802a2d5ea50f4f3249164dc71376f23375e61983' 
  AND token = 'xIOq+0MAo2kulYppd18nLFjwURja1Dc2qLFA9JP8la0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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