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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c5bcbae5bc564fa0aa282a0d9554c9f2981050e2bd78258a38575db79554e78' 
  AND token = 'Uvhk2K8x1x2hXGQB7uwF5CDURqOhgXmEApod8AnrPV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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