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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88b5ae05baca1f9d7dcccb256663b4986f5e926c15e04c9bee8568ed74fea733' 
  AND token = '5oVztnU9+DZP47HcDzWVBOem1Fao7+7koFKcFjyWkzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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