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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7ed35a50988fd72427e23c302b9ba177c099494e8b5a3b76f8c1a3486567646' 
  AND token = '/osQOOMNEjNo4d4JtuXQLIFJTF1gUcjb41o3TJsDA/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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