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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9eebdc9a30f0a723b1d2dca1c83aa49cc7294f0b378c282512a7c6cc2d25326c' 
  AND token = '3hGzqiv8Y2R7Btcjnd/sRDHUhD4wEOwpAfRG0qUAYB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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