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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd291703498a7eb0f5232cceb8d5282cb5eb602c3384c24728a0597231760b4d4' 
  AND token = 'fusugbN3YD7413D9KcXJThkSNTwJ1d8LAfiQYNQ922Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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