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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '161d65581b455ec7bf52c330b9f8b49436bcca8364d0519efdf7655af5a39843' 
  AND token = 'Bjnfc72eXcpap++smWkqRpAgIU8P6ey7xm9/3yKaJy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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