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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9af5510decf079fd55c13a2b1f2b0f68d890429f93e88b33fec133444293df40' 
  AND token = 'zK1Wk5Mn9bv4LF8eCdJmaUEIk+1mlPdSe2QH0Kuh0aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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