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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47392ace42258ec3b480ccf2c634fc15a1c95d48c284770ae3f074d24ff288de' 
  AND token = 'Y838p9Com9c6HWk8+tAsmf+K+xPAF6IIdJh6pcVZY+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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