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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09a1f6e1fd6e000645501772453c5fb70303e9bb93075521e2a2dc14d38d8014' 
  AND token = 'CEplJYgMxgTEsePFq7G8Rc39QaJePtW5H8AjKmNw2r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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